Multiple choice

Which of the following statements is/are false?

a. Treating the sludge with anaerobic bacteria is a step in the secondary treatment of sewage. b. The biogas that is produced at the end of the second stage in the treatment of sewage is methane. c. During the third stage of treatment of sewage, disinfection of water is done by using calcium.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only c
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

During the third stage of treatment of sewage, disinfection of water is done by using calcium, is a false statement. Thus, it is a correct option. During the third stage of treatment of sewage, disinfection of water is done by using ozone or chlorine.

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